<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>

         <!-- 卡片视图区域 -->
        <el-card>
          <!-- 警告区域 -->
          <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

          <!-- 选择商品分类区域 -->
          <el-row class="cat_opt">
            <el-col>
              <span>选择商品分类：</span>
              <!--
                选择商品分类的级联选择框
                :options="catelist"  : 获取数据源
                :props="cateProps" ：配置级联选择框 cat_id等 为catelist中的数据名 （value: 'cat_id',label: 'cat_name',children: 'children'）
                v-model="selectedCateKeys" ：选中的cat_id值双向绑定到selectedCateKeys中
                @change="handleChange"  ：绑定选择项改变的事件
              -->
              <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
              </el-cascader>
            </el-col>
          </el-row>

          <!-- tab 页签区域 -->
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
              <!-- 添加参数的按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
              <!-- 添加属性的按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
              <!-- 静态属性表格 -->
              <el-table :data="onlyTableData" border stripe>
                <!-- 展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
            </el-tab-pane>
          </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
          <!-- 添加参数的对话框 -->
          <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
          </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
          <!-- 添加参数的对话框 -->
          <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
              <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
          </el-form>
          <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
import {
  getCateListApi,
  getAttributesByCateId,
  postAttributesByCateId,
  getAttributesByAttrId,
  putAttributesByAttrId,
  deleteAttributesByAttrId
} from '@/api/home/cateApi.js'

export default {
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id', // 选中的值
        label: 'cat_name', // 看到的值
        children: 'children' // 下一级的值
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的tabs页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      await getCateListApi(this.querInfo).then(res => {
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            type: 'error',
            message: res.meta.msg,
            showClose: true
          })
        }
        // 把数据列表，赋值给 catelist
        this.catelist = res.data
        // console.log(this.catelist)
      })
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange () {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      // 证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      await getAttributesByCateId(
        { id: this.cateId, sel: this.activeName }
      ).then(res => {
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            type: 'error',
            message: res.meta.msg,
            showClose: true
          })
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''
        })

        // console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      })
    },
    // 监听添加对话框的关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮，添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        await postAttributesByCateId(
          { id: this.cateId },
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        ).then(res => {
          console.log(res)
          if (res.meta.status !== 201) {
            return this.$message({
              type: 'error',
              message: res.meta.msg,
              showClose: true
            })
          }
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      })
    },
    // 点击按钮，展示修改的对话框
    async showEditDialog (attrId) {
      console.log(attrId)
      // 查询当前参数的信息
      await getAttributesByAttrId(
        {
          id: this.cateId,
          attrId: attrId
        },
        {
          attr_sel: this.activeName
        }
      ).then(res => {
        console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            type: 'error',
            message: res.meta.msg,
            showClose: true
          })
        }
        this.editForm = res.data
        console.log(this.editForm)
      })
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        await putAttributesByAttrId(
          {
            id: this.cateId,
            attrId: this.editForm.attr_id
          },
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        ).then(res => {
          // console.log(res)
          if (res.meta.status !== 200) {
            return this.$message({
              type: 'error',
              message: res.meta.msg,
              showClose: true
            })
          }
          this.$message.success('修改参数成功！')
        })
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除的业务逻辑
      await deleteAttributesByAttrId(
        {
          id: this.cateId,
          attrId: attrId
        }
      ).then(res => {
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            type: 'error',
            message: res.meta.msg,
            showClose: true
          })
        }
        this.$message.success('删除参数成功！')
      })
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下了 Enter 都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求，保存这次操作
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals (row) {
      // 需要发起请求，保存这次操作
      await putAttributesByAttrId(
        {
          id: this.cateId,
          attrId: row.attr_id
        },
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      ).then(res => {
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message({
            type: 'error',
            message: res.meta.msg,
            showClose: true
          })
        }
        this.$message.success('修改参数项成功！')
      })
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
